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Related-Party Transactions - Details of Amounts Due to Related Parties on Our Accompanying Condensed Consolidated Balance Sheets (Detail) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Related Party Transactions [Abstract] |  |  |  |
Management fee due to Adviser | $ 295,748 land_ManagementFeeDueToAdvisor |  | $ 301,487 land_ManagementFeeDueToAdvisor |
Credits to fees due to Adviser | (320,905)land_CreditsToFeesDueToAdviser |  |  |
Other due to Adviser | 11,707 land_OtherDueToAdvisor |  | 3,187 land_OtherDueToAdvisor |
Total due (from) to Adviser | (13,450)land_DueFromToAdviser |  | 304,674 land_DueFromToAdviser |
Administration fee due to Administrator | 130,936 land_AdministrativeFeeDueToAdministrator |  | 166,427 land_AdministrativeFeeDueToAdministrator |
Total due to Administrator | 130,936 land_FeeDueToAdministrator |  | 166,427 land_FeeDueToAdministrator |
Total due to related parties | $ 117,486 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent | [1] | $ 471,101 us-gaap_DueToRelatedPartiesCurrentAndNoncurrent | [1]
[1] | Refer to Note 4, "Related-Party Transactions," for additional information.

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- Definition Carrying amount as of the balance sheet date of obligations due all related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3),(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 3, 4 -Article 9 + Details
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